Basic azo dyes.



No Drawing.

UNITED- TATES ATENT OFFIQE.

AUGUST BLANK AND MATTHIAS LATTEN,- or LEVERKUSEN, NEAncoLo NE, GER: MANY, ASSIGNORS T FARBENFABRIKEN VORM. FRIEDR. BAYER- "at (10., or

ELBERFELD, GERMANY, A CORPORATION or GERMANY.

nAsro Azo DYES.

I To all whom may concem:

'free from salt-forming acid groups, such as aminophenyltrialkylammonium chlorids ofthe formula:

. IEIH,

N R. and aminobenzylpyridonium chlorid of the formula: t

into the symmetrical diarylurea compounds by treatment with phosgen.

The new dyes are after being dried and pulverized dark powders soluble in concentrated sulfuric acid generally with a reddish coloration. They have a constitution corresponding to the formula and dyes cotton and.artificial silk yellow. The analogous dye obtained from l-arninophenyI-3-trimethylammonium chlorid and cresidin has similar tinctorial properties. The dye obtained from alpha-naphthylamin dyes orange-red.

Hns'tead of cresidin other components may I be used, such as para-xylid'in, meta-toluidin, meta-anisidin or the like.

Specification of Letters Patent.

Patented Feb. 1 7, 15914.

in which R is the raadicai of a quarternamy ammonium compound and- R a substituted the ammonium compound, a diai'nin and carbonic acid, are obtained. 1 The new dyes are distinguished by the valuable properties of dyeingcotton directly in the soda alkaline bath shades fast to washing and of dyeing artificial silk fast to water in acetic acid solution.

To illustrate our process, wecan proceed as follows the parts being by weight :-37 parts of the aminoaze' compound,- obtainedfrom diazotized aminobenzylpyridonium,

chlorid and cresidin, are dissolved in 2100 parts of hot water, 52 arts of sodium acetate are added and the liquid which must be acid (acetic acid) is filtered. Into the limpid filtrate phosgen is introduced while stirring until the production of the urea is complete.

cold concentrated sulfuric acid with a bluish-red coloration and soluble in water The new coloring matter is filtered off and dried. It is after being dried and pulverized a black powder soluble in.

with ayellowishto orange coloration; yielding upon reduction with stannous chlorid and hydrochloric acid the aminobenzyh' pyridonium chlorid of the formula:

We claim I 1. The new basic azo dyes being ureas of aminoazocompounds free from salt-forming acid groups, having a constitution corresponding to the formula in which R is the radical of a'quarternary ammonium compound and R an aromatic radical, which dyes are after being dried and 7' pulyerized dark powders soluble in concentrated sulfuric acid generally with a reddish coloration; yielding upon reduction with stannous chlorid and hydrochloric acid a basic compound, a diamin and carbonic acid; dyeing cotton directly in the soda alkalinev bath shades fast to washing and dyeing artificial silk in acetic acid solution fast to water, substantially as described.

2. The new basic azo dyes being ureas of aminoazo compounds tree from salt-forming acid groups, having a constitution correspending to the formula Y in which E is the radical of a quarternary ammonium compound and it a methyl substituted radical of the benzene series, which dyes are after being dried and pulverized dark powders soluble in concentrated sulfuric acid generally with a reddish coloration; yielding upon reduction with stannous chlorid and hydrochloric acid a basic compound, a diamin and carbonic acid; dyeing cotton directly in the soda alkaline bath which is after being dried and pulverized a black powder soluble in cold concentrated sulfuric acid with a bluish-red coloration s and being soluble in water with a yellowish to orange coloration; yieldin upon reductron with stannous chlorid an hydrochloric acid aminobenzylpyridonium, anuinocresidin and CD and dyeing cotton from the allurline bath and artificial silk yellow substantially as described.

insane? furnishing'shades fast to washing and dye 1' ing artificial silk in acetic acid solution giving dyeings which are fast to water, substantially as described.

3. The new basic azo dyes being ureas of (a aminoazo compounds free from salt-forming groups, having a constitution corresponding to the formula (RNzN-R-NH) G0 in which R is the radical of benzylpyridonium chlorid, and R's substituted radical of the benzene series, which dyes are after being dried and pulverized dark powders soluble in concentrated sulfuric acid generally with a reddish coloration; yielding upon reduction with stannous chlorid and-hydrochloric acid a basic compound, a diamin and carbonic acid; dyeing cotton directly in the soda alkaline bath furnishing shades fast to Washing and dyeing artificial silkin acetic acid solution, giving dyeings which are fast to water, substantially as described.

i. The herein described new azo dye hav; ing most vprobably the formula:

[L. ed [a s.] 

